Quantity In Stock: 4
Before Ordering: Select the Correct Kit for Your Truck
Use the reference photos below to identify your factory transmission cooler line configuration and select the matching kit option.
Not sure which kit you need? Send us your VIN or photos and we'll help verify fitment before you order.
Stop Leaking Duramax Transmission Cooler Lines for Good
Tired of leaking Duramax transmission cooler lines? Our upgraded 5/8" transmission cooler line kit replaces failure-prone factory lines on 2001-2016 Chevy Silverado and GMC Sierra Duramax trucks. Built to last and backed by our No Questions Asked Lifetime Warranty.
Leaking transmission cooler lines are one of the most common issues on Duramax trucks. Factory lines can corrode, seep, or fail over time, leading to transmission fluid loss and potentially expensive repairs.
Our upgraded 5/8" Duramax Transmission Cooler Line Kit is designed to provide a reliable, long-lasting solution for Chevy Silverado and GMC Sierra HD trucks equipped with the Duramax diesel and Allison transmission. Whether you're fixing an active leak or replacing aging factory lines before they fail, this kit delivers the durability and performance your truck needs.
Features
✔ Replaces failure-prone factory transmission cooler lines
✔ Fits 2001-2016 Duramax diesel trucks
✔ Compatible with Allison transmissions
✔ High-quality fittings and components
✔ Helps prevent transmission fluid leaks
✔ Designed for long-term reliability
✔ Easy installation
Fits
• LB7 Duramax (2001-2004)
• LLY Duramax (2004.5-2005)
• LBZ Duramax (2006-2007)
• LMM Duramax (2007.5-2010)
• LML Duramax (2011-2016)
Vehicle Applications
• Chevy Silverado 2500HD & 3500HD
• GMC Sierra 2500HD & 3500HD
Don't wait until a small leak becomes a costly transmission repair. Upgrade your Duramax transmission cooler lines today and drive with confidence.
No Questions Asked Lifetime Warranty
We stand behind every kit we sell. If you ever experience an issue, we'll make it right.